LILBURN - A Lawrenceville man was behind bars Thursday for threatening to beat up his stepson's Berkmar High School teacher, officials said.

Daniel D. Melancon, 29, is charged with abusing public school staff and disruption of a public school for an alleged Sept. 6 outburst at the Lilburn school.

Melancon remained at the Gwinnett County Jail on $11,400 bond Thursday.

According to a school police report, the incident happened during a Saturday morning detention session in a classroom at Berkmar. Melancon, accompanied by his stepson and wife, Kimberly, knocked on the classroom's door and summoned a teacher, Adam Bykofsky, to come to the hallway, the report says.

When the teacher refused, Melancon entered the class and ordered his stepson to sit down. Then Melancon and his wife approached Bykofsky and began cursing and threatening him in front of 17 other students, the report says.

Melancon said, "I will (expletive) you up" while his wife also chided the teacher, the report says. After "a couple minutes of the abuse," Bykofsky asked the parents to step outside the classroom, and they left, a school resource officer wrote.

Sloan Roach, Gwinnett County Public Schools spokeswoman, said a school administrator questioned 10 students at random who witnessed the incident.

"Their statements verified what the teacher had said," Roach said.

School police secured warrants for Melancon's arrest, and he was taken into custody Wednesday.

Roach said it was unclear what allegedly ticked off Melancon in the first place.

"If they did not (leave the school), there could have been further charges," she said.

No one could be reached for comment Thursday at Melancon's Lawrenceville residence.